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SINHCAF/FAM60A and SIN3A specifically repress HIF-2α expression.

John Biddlestone1,2, Michael Batie1,3, Daniel Bandarra1

  • 1Centre for Gene Regulation and Expression, School of Life Sciences, University of Dundee, Dundee DD1 5EH, U.K.

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The SIN3A-HDAC complex component SINHCAF/FAM60A regulates the hypoxia response by repressing HIF-2α. This finding reveals a new role for SINHCAF in cellular processes like angiogenesis and viability.

Keywords:
HIF-2histone deacetylasesSIN3ASP1hypoxiahypoxia-inducible factorstranscription

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Cancer Biology

Background:

  • The SIN3A-HDAC complex is a key transcriptional repressor involved in development and disease.
  • Dysregulation of this complex is implicated in various pathological conditions.

Purpose of the Study:

  • To investigate the role of the novel SIN3A-HDAC complex component, SINHCAF/FAM60A, in cellular regulation.
  • To elucidate the mechanism by which SINHCAF influences the hypoxia response.

Main Methods:

  • Investigated the interaction between SINHCAF and the SIN3A-HDAC complex.
  • Analyzed the effect of SINHCAF on HIF-2α expression using molecular biology techniques.
  • Examined the recruitment of HDAC1 to the HIF-2α promoter via SINHCAF-SP1 interaction.
  • Assessed functional cellular changes in angiogenesis and viability.

Main Results:

  • SINHCAF/FAM60A was identified as a new component linking the SIN3A-HDAC complex to the hypoxia response.
  • SINHCAF specifically represses HIF-2α mRNA and protein expression.
  • This repression occurs through SP1 interaction and HDAC1 recruitment to the HIF-2α promoter.
  • SINHCAF-mediated HIF-2α regulation impacts *in vitro* angiogenesis and cell viability.

Conclusions:

  • SINHCAF/FAM60A plays a critical role in regulating the hypoxia response pathway.
  • The study reveals an unexpected link between SINHCAF and HIF-2α, impacting cellular functions.
  • This discovery opens new avenues for understanding and potentially targeting diseases involving the hypoxia response.